The presser foot pressure is not adjustable on the 900 Nova and is not necessary with any Bernina models from the 117L through the 1630 series. If the presser foot bar is sticking so that it is sluggish to respond to the needle plate, the presser bar and bushings will need to be cleaned of oil varnishes in order to function properly. (99.9% of the problem)
The other potential problem although unusual, is that the machine frame has been damaged from a drop or impact, causing the presser bar frame bearings to be out of alignment, hence a sticking shaft condition. You do not want to attempt to correct this as you will likely ruin the machine. Suggest contacting a specialist
SOURCE: loose pressure foot - how do I tighten on a Bernina 160 Virtuosa?
use small screwdriver provided, usually orange, streight edge,
SOURCE: I turned off my machine to change the pressure
The machine Knows the foot number buy the small glass part of the foot just on the upper right side of the foot. Check to see if that is not damaged and clean. Also check the sensor on the machine just above the foot for not damage and clean. If that is good make sure your foot is paralel with the stitch plate. Do this buy putting a single hole foot on your machine and make sure the needle is right in the center. If this does not work you will need to take it in. May be a bad sensor or unpulged but that is rare.
Also not all bernina feed have this foot sensor, if this is the case it will not read it
hope this helps
SOURCE: bernina 180 pressure foot settings
it sounds like the feeddogs are not holding the fabric against the
presser foot,, check the feeddog to see if they are up, where you
can feel them with your finger in the needle plate area
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